fixed some compiler warnings (added string.h include)

cleaned up compiler warnings, and fixed some big endian compile errors

added missing openssl/err.h include

added missing prototype for lanplus_dump_rakp4_message

moved ipmi_csum to helper, as both lan and lanplus use it.

moved ipmi_csum to helper as both lan and lanplus use it.

factored ipmi_csum to helper.c, as both lan and lanplus use it.

make completion_code_vals extern'd. probably needs to be factored out of
the ipmi_bmc stuff if others are using it.

apparently EVP_aes_128_cbc is in libcrypto.

add support for ipmiv2 with lanplus interface
from Jeremy Ellington

Enhance user command and rename it to getaccess.
Implement setaccess command.

Fix call to intf->open to match new definition.

don't send ping twice, and don't complain when ping is not answered

fix chassis power control, it needs admin privlvl

don't print warning when openipmi header files not found

changes to handle session structure inside of intf structure

add note about -L parameter,
changes for "channel info" and "snmp" settings

add ipmi_intf header

add support for setting SNMP community string

use helper functions to set session variables,
remove "event" and "userinfO" functions from this file

rework these to open on first call to sendrecv

add functions for setting session variables

add support for "channel user" command

add str2val() and min() helpers

rename "Community String" to "SNMP Community String"